Lakes

Lakes can reduce flood intensity by holding excess water for some time. In exams treat storage capacity as the key term.

Many Himalayan lakes are linked with glacial action. In exams connect mountain lakes with glaciers and basin shapes.

Lakes may support river flow by providing water during dry periods. In exams understand the link between seasonal flow and lakes.

Due to the heat capacity of water, lakes can moderate nearby temperature. In exams write climate moderation as a local effect.

In closed drainage, water does not flow out and evaporation concentrates salts. In exams link salinity with evaporation and closed basins.

Lakes provide habitat to aquatic organisms and plants. In exams view lakes as both water resources and habitats.

A lagoon forms near coastal barriers and an oxbow lake forms from a river meander. In exams differentiate lakes by origin.

Silt deposition reduces lake depth and may lead to marsh formation. In exams link deposition with the life cycle of a lake.

Lakes can increase local employment through activities like boating and tourism. In exams include economic importance too.

An oxbow lake may be crescent shaped due to an old meander. In exams connect shape with the formation process.

Pulicat is a famous lagoon lake on the east coast. In exams remember it as an example of a coastal lagoon.

Dal Lake is a famous tourist lake in the Kashmir region. In exams link Dal with Srinagar and tourism.

High evaporation and low outflow cause salts to accumulate. In exams understand salinity through water balance.

The direct answer is A, lakes have the capacity to hold and release water. A lake acts like a temporary natural storage basin. Step by step: rain or river water enters the lake; the lake stores part of this water; during heavy flow it can reduce the sudden movement of water, and later water may flow out gradually or support the river. This is why lakes can regulate river flow and sometimes reduce floods or maintain flow in drier periods. Option A is correct because storage and controlled release are the relevant reasons. Option B, lakes always raising the river bed, is not a general function and does not explain regulation. Option C, making all rivers underground, is factually false. Option D, permanently stopping clouds, is impossible and unrelated to river-flow control. The exact effect depends on the lake, its outlet and local conditions, so “control” does not mean complete control. Memory cue: a lake is a water buffer—store now, release later.

A coastal lagoon may show marine influence because it lies near the sea. In exams link lagoons with the sea coast.

When an oxbow lake forms, the river separates from the cut-off meander and takes a shorter route. In exams link it with river straightening.

A lake may be natural or artificial but a reservoir is generally made by a human-built dam. In exams note the human-made and natural difference.

Excess nutrients can increase algal growth and reduce water quality. In exams understand the link between pollution and eutrophication.

Lakes influence landscape scenery and human uses like tourism. In exams link scenic beauty with economic use.

Silt brought by a river settles on the lake bed. In exams connect river deposition with decreasing lake depth.

Wular is a famous large freshwater lake of Kashmir. In exams link Wular with Kashmir and freshwater.

Sand bars and barriers can separate coastal water and form lagoons. In exams link coastal lakes with barriers.

Boating shows economic use and aquatic habitat shows ecological importance. In exams write examples showing dual importance.

The direct answer is B: Chilika. A coastal lagoon is a shallow water body near the sea, partly separated from the sea by a sandbar, barrier, or spit, while remaining connected to seawater through an opening or channels. Step by step: coastal waves and sediment create a separating barrier; seawater and freshwater may mix; the enclosed shallow water becomes a lagoon ecosystem; fish, birds, and other organisms use it. Chilika Lake is in Odisha on the eastern coast of India and is a famous brackish coastal lagoon. Option B is correct. Option A, Sambhar, is a famous inland saline lake in Rajasthan, not the expected coastal lagoon here. Option C, Wular, is a large freshwater lake in Jammu and Kashmir and is not a coastal lagoon. Option D, Bhimtal, is a freshwater lake in Uttarakhand, also inland. Remember: Chilika means Odisha coast and lagoon.

Water withdrawal and encroachment can reduce lake area. In exams write human pressure as a cause of lake degradation.